class_docstr: Randomly inserts filler words and phrases in the sentence.
  Perturbation example:
  
  **Input:**
      The quick brown fox jumps over the lazy dog.
  
  **Output:**
      The quick brown fox jumps over probably the lazy dog.
code: def description(self) -> PerturbationDescription:
      return FillerWordsPerturbation.Description(
          name=self.name, robustness=True, insert_prob=self.insert_prob
      )
  
file_path: H2O/h2o_hf/helm/src/helm/benchmark/augmentations/filler_words_perturbation.py
imports: from dataclasses import dataclass
  from .perturbation import Perturbation
  from .perturbation_description import PerturbationDescription
  from random import Random
label_desc: Use image node_id 2 for calling the FillerWordsPerturbation obj's underlying member method code with example usage: obj.description() and returns: FillerWordsPerturbation